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Use 32-bit values, not 16, for IP ID values.

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IP ID fields are overloaded to include the flow label of IPv6 packets.
In particular, abstract_ip_hdr is no longer limited to 16 bits.
This commit is contained in:
david
2013-10-27 06:33:45 +00:00
parent a628c0ae9c
commit 5df0e13ee2
3 changed files with 5 additions and 6 deletions
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3
libnetutil/netutil.cc
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@@ -730,8 +730,7 @@ static const void *ip_get_data_primitive(const void *packet, unsigned int *len,
memcpy(&sin6->sin6_addr, &ip6->ip6_dst, IP6_ADDR_LEN);
hdr->ttl = ip6->ip6_hlim;
/* abstract_hdr.ipid is limited to 16 bits. */
hdr->ipid = (u16) ntohl(ip6->ip6_flow & IP6_FLOWLABEL_MASK);
hdr->ipid = ntohl(ip6->ip6_flow & IP6_FLOWLABEL_MASK);
return ipv6_get_data_primitive(ip6, len, &hdr->proto, upperlayer_only);
}

2
libnetutil/netutil.h
View File

@@ -160,7 +160,7 @@ struct abstract_ip_hdr {
struct sockaddr_storage dst;
u8 proto; /* IPv4 proto or IPv6 next header. */
u8 ttl; /* IPv4 TTL or IPv6 hop limit. */
u16 ipid; /* IPv4 IP ID or IPv6 flow label. */
u32 ipid; /* IPv4 IP ID or IPv6 flow label. */
};
void netutil_fatal(const char *str, ...)

6
scan_engine.cc
View File

@@ -269,7 +269,7 @@ struct IPExtraProbeData_sctp {
};
struct IPExtraProbeData {
u16 ipid; /* host byte order */
u32 ipid; /* host byte order */
union {
struct IPExtraProbeData_icmp icmp;
struct IPExtraProbeData_tcp tcp;
@@ -328,7 +328,7 @@ public:
}
/* not reached */
}
u16 ipid() const {
u32 ipid() const {
return probes.IP.ipid;
}
u16 icmpid() const; // ICMP ident if protocol is ICMP
@@ -934,7 +934,7 @@ void UltraProbe::setIP(u8 *ippacket, u32 len, const probespec *pspec) {
data = ipv6_get_data_any(ip6, &len, &hdr);
assert(data != NULL);
assert(len == (u32) ntohs(ip6->ip6_plen));
probes.IP.ipid = ntohl(ip6->ip6_flow & IP6_FLOWLABEL_MASK) & 0xFFFF;
probes.IP.ipid = ntohl(ip6->ip6_flow & IP6_FLOWLABEL_MASK);
hdr = ip6->ip6_nxt;
} else {
fatal("Bogus packet passed to %s -- only IP packets allowed", __func__);